Question

Boron and aluminium are trvalent why ?
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Answer 1

Answer:

The p-Block Elements. (ii) Boron and aluminium tend to form covalent compounds. (i) The electronic configuration of 5B is 1s2 2s2 2p1. Its tri valency is explained by promoting the electron from 2s to 2p so that number of unpaired electrons become three.

Explanation:

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